Jeep Rear Axle Truss Corporate 14 Bolt Jeep TJ/LJ TNT Customs. TNT Customs 14 Bolt 1/4 inch formed steel axle truss is ideal for your Jeep TJ/LJ Wrangler. Designed to help distribute the load put on the rear housing at any one time. All of our trusses require welding to install. We strongly recommend using a certified welder for any welding tasks.